From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3B9C1C4707B for ; Wed, 10 Jan 2024 14:31:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=JCgRgohghaIuzxU15lQv+DUCl1G/JFrp85MtXKRoklg=; b=m6dlJCdXwgggcHlhze36RHdkv9 sROWVxp7P56LUinhgLxEToltH96B34Z5bg1I94IE5fzf3nuyAFa4W9odvPd/70ocHdHWUBBhwdgav x0NRDkMVlqhrZ3XNHsG8Ym2QSoR4rhddnoh/BJs/4Hu+aHct94U3ERrUjMYlp+SoffThgnEzSGgq/ aeAWposYcRjsoPhCpEpBM4LkVIFSVfOshUFxcY6bmSFGh1mbp1g7sUsJgt22l2w7RsUAiOlNmxuYQ CsKpxRwcI56YeLRnAHsqVawIJG+zsllVrPgEimR2sDfCXzZn960azxpi0i1USaKSnTriXZn/HP7qq YWXcThAw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rNZcE-00CKtU-0P; Wed, 10 Jan 2024 14:31:34 +0000 Received: from madrid.collaboradmins.com ([46.235.227.194]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rNZcA-00CKro-2p; Wed, 10 Jan 2024 14:31:32 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1704897089; bh=6HC5IEm/hZtyU1ep9WTyrEat/6wqniqFyQTDH7oldac=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ypZPRcPBiCi4FSvhHWtelzW8Iqz7OsmAJXu7A0010JJ6IC4YdDDrk+fNTpFydaGFE t7EA2TpIdOCMnxk3osEoWznAWmWcBV+Xi7sNtEHM8A4HMYJaEx7VXKITOhb2HbbCFm /SwMxRVHlH5Nvh522RlG2QPrORYNanGU4a0JB6tKL6waTNC1LzLagthUKmWLKTvgLR FNiNbH3NLNegRyTmigohyJidyWD8io6G4Wb30VopiBFdSyy5ePtoLkVWQPtMm7TKOM EkdQcebT70VhD9Y3/0G/U6sMgTaNkqe6E5hN/Rov4hGt6WNQIMKPfkWhtrZOkvoCnK X0pZ5H1nHU7FQ== Received: from [100.113.186.2] (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madrid.collaboradmins.com (Postfix) with ESMTPSA id 8C1ED378045F; Wed, 10 Jan 2024 14:31:28 +0000 (UTC) Message-ID: <54f3facf-375d-4d23-9003-5ffbda2284dc@collabora.com> Date: Wed, 10 Jan 2024 15:31:27 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] cpufreq: mediatek-hw: Wait for CPU supplies before probing Content-Language: en-US To: =?UTF-8?B?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= , Viresh Kumar , "Rafael J . Wysocki" , Matthias Brugger Cc: kernel@collabora.com, "Hector.Yuan" , Liam Girdwood , Mark Brown , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-pm@vger.kernel.org References: <20240110142305.755367-1-nfraprado@collabora.com> <20240110142305.755367-3-nfraprado@collabora.com> From: AngeloGioacchino Del Regno In-Reply-To: <20240110142305.755367-3-nfraprado@collabora.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240110_063131_107722_DCEE7834 X-CRM114-Status: GOOD ( 10.56 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Il 10/01/24 15:23, Nícolas F. R. A. Prado ha scritto: > Before proceeding with the probe and enabling frequency scaling for the > CPUs, make sure that all supplies feeding the CPUs have probed. > > This fixes an issue observed on MT8195-Tomato where if the > mediatek-cpufreq-hw driver enabled the hardware (by writing to > REG_FREQ_ENABLE) before the SPMI controller driver (spmi-mtk-pmif), > behind which lies the big CPU supply, probed the platform would hang > shortly after with "rcu: INFO: rcu_preempt detected stalls on > CPUs/tasks" being printed in the log. > > Fixes: 4855e26bcf4d ("cpufreq: mediatek-hw: Add support for CPUFREQ HW") > Signed-off-by: Nícolas F. R. A. Prado > Reviewed-by: AngeloGioacchino Del Regno